Can't execute shell script from python subprocess: permission denied

Tried googling but couldn't find something that relates to my particular problem. I'm trying to run a shell script from python but the shell script wouldn't run because of a permission denied error. The python code I'm running is: ``` process = subprocess.Popen('run.sh', shell=True, stdout=subprocess.PIPE) process.wait() .... os.killpg(pro.pid, signal.SIGTERM) ``` The error I'm getting: ``` python RunScript.py "input" /bin/sh: 1: run.sh: Permission denied ``` The contents of my shell script is: ``` #!/bin/sh abspath=$(cd "$(dirname "$0")"; pwd) CLASSPATH=$CLASSPATH:$abspath/"lib/*":$abspath/"bin" export CLASSPATH java -classpath $CLASSPATH my.folder.path.Class $abspath/../data/data.txt $abspath/../data/data2.txt ``` Thanks in advance.